Quality rating
Updated
Quick answer: The quality rating is Meta's score for a WhatsApp Business API phone number, shown as green (high), yellow (medium) or red (low). It is based on how customers reacted to your messages recently — mainly blocks and reports. A low rating can stop your messaging limit from increasing or lower it, and Meta can also pause individual templates with poor feedback.
Meta's score for how customers react to your messages.
Sending only to opted-in customers, keeping messages relevant and making opt-out easy are the best ways to keep the rating green.